Combustion tube for oil burners



. Nov. 26, 1929. w. M. GRIFFIN COMBUSTION TUBE FOR OIL BURNERS Filed set. 24, 1928 2 Sheets-Sheet 1 Fig. 2.

INVENTOR ATTORNEY Nov. 26, 1929.

W. M. GRIFFIN COMBUSTION TUBE F OR OIL BURNERS 2 Sheets-Sheet 2 INVENTORd. M MP ATTORNEY Filed Sept. 24, 1928 Patented Nov. 26, 1929 UNITEDSTATES PATENT OFFICE WILLIAM GRIFFIN, or FOR WAYNE, mmANAfAs 'IeNoE To'I'HE WAYNE HOME EQU PMENT COMPANY, or BALTIMORE, MARYLAN LANDooMEUsTIoN TUBE A CORPORATION OF MARY- Eon OIL BURNERS Application filedSeptember 24, 1928. Serial No. 308,012.

My invention relates to apparatus for burning liquid fuel, andparticularly to the combustion tubes of such apparatus. The inventionmay be used on oil burners of relativel small size, such as those forheating dwel 'ng houses and for larger installations.

To ensure safe and efiicient'combustion of the fuel, the rearward partof theflame must be maintained a short distance in front of the burner.nozzle. If the flame rests upon or surrounds the end of the nozzle,carbon deposits will soon partially or wholly close the fuel outletorifice,or accumulate on the nozzle so as to re ent normal discharge ofair from the com ustion tube, or interfere with ignition, or all ofthese. If the flame ismaintained too far forward of the end of thenozzle, it is apt to be blown out; whereupon normal continued feed offuel upon the heated firebox wall is liable to cause an explosion.

This invention constitutes an improvement on the invention of Harry F.Smenner, application for Patent Serial No. 307,988, filed. September 24,1928.

While an ample quantity ofair must be provided I have found that it isvery important that the air supplied to the combustion tube should be sodirected that it will not pass directly over the flame.

The principal object of my invention is to so direct the air enteringthe combustion tube that it will not flow directly over the spraynozzle. In fact I prefer that it be deflected backwardly, that is, awayfrom the front end of the combustion-tube upon entering said tube. Adevice so constructed produces safe and efiicient combustion regardlessof the exact position of the spray nozzle with relation to the inner endof the combustion tube and therefore but slight care need be used inassembling the oil tube and nozzle in the combustion tube.

A rotating air supply f ed thru the wall of the combo ion tube, towardthe back end thereof maintains a rapidly rotating tubular air column,constantly emerging from the front of the combustion tube, withsubstantially no air pressure at the center where the spray nozzle islocated.

Two embodiments of my invention are illustrated in the accompanyingdrawings, in which Figure 1, is a perspective from above the combustiontube with the burnerassembled therein, comprising a main tube and branchtubes connected with the main tube tangentially, one to the top side andthe other to the bottom side, the back endof the tubes being brokenaway,

Fig. 2, is a cross section of the tubes only, on the line 2-2 of F ig.1, and

Fig. 3 is a longitudinal section of the tubes only, on the line 3-3 ofFig. 2,

Fig. 4 is a top plan view of another form of the combustion tube andburner assembly with the rearward ends of the'connections broken away.The combustion tube proper and air supply tube are two parallel tubesformed integrally and tangentially connected,

Fig. 5 is an end view of the combined combustion and air supply tubefrom the rear,

Fig. 6 is a cross section of the combined combustion and air supply tubeonly on the line 6-6 of Fig. 4,

Fig. 7 is a longitudinal section of the combined combustion and airsupply tube only on the line 7-7 of Fig. 5,

Fig. 8 is a longitudinal section on the line 8-8 of Fig. '5.

Referring now to the drawings and particularly to Figs; 1 to 3inclusive; 1 is the I main combustion tube, with branch tube 2, closedat its front end, connected with the main tube tangentially on the underside of the main tube, and branch tube 3, also closed at its front end,connected with the maintube tangentially on the top of the main tube, sothat air forced into tubes 2 and 3 from their rearward ends will rotatewithin the main tube 1, around thburner nozzle 5 as indicated by thearrows. Electrodes 6, 6 are conveniently located to supply initialignition.

' Obviously the branch tubes need not be connected to the maincombustion tube directly opposite each other, and if one was soconnectused if more than two air currents were desired.

The preferred form of the device is shown in Figs. 4 to 8 inclusive, andWlll now be described. The main combustion tube 14 has a parallel airsuppl tube 15 closed at its front end, both tubes pre erably formed ofone casting with a tangential ogening from the latter to the former at16. I his opening may be coextensive with their joint length or a. lessdistance. In the drawings it has been shown as extendin from a partltion17 to the front end of the air supply tube 15 with a cross partition 18of suitableheight to prevent all the air supplied to the tube 15 fromthe rear 19 impinging upon the front end 20 of said tube, but willdivert part of the air to the mam tube 14 in a separate current.Obviously I there might be a plurality of such partitions 2o 18 andof'ditferent heights if desired, if more than two such streams of airinto the m'am tube from the air supply tube are desired.

Partitions 17, 18 and 28 are all inclined backwardly, that is so as todivert the air entering I the combustion tube 14 toward the back of saidtube.

An'axially adjustable housing 21 complete- 1y closes the back end of themain tube 14.

Through this housing extend the electrodes 6 and 6" and the fuel oilsupply tube 22, the

inner end of which terminates in the spray nozzle 5.

An opening through the side of the main tube, is closed by a mica window23'and is pro- 5,tected externally by a window housing 24, having ahinged guard door 25, which may be raised to observe the conditions onthe insideof the fire- 0t (not shown).

The combine main tube and air supply tube may have a longitudinalpassage 26 to supply air direct from outside the fire-pot to itsinterior and the su ply of direct air therethrough is regulated y theadjustment of the position of the cover plate 27.

Although certain forms of the invention have been shown and described itwill be understood that a mechanic, worliing within the scope of what isclaimed, may makechanges, without departing from the spirit of theinvention. I claim as In invention and desire to secure by Letters atentof the United States 1. In a combustion tube for apparatus for burninliquid fuel, means for supplying air throng the wall of said tubesubstantially tangentially thereof and means for diverting plaid towardthe back end of the combustion tu 3. In a combustion tube for apparatusfor burning 1i uid fuel, a fuel supply pi e and its spray nozz epositioned substantial y axiall of said tube, means for supplyin airthroug the wall of said tube substantialg tangentially thereof andcontiguous to said nozzle, means for dividing the air current sosupplied and means for diverting the air so supplied toward the back endof the combustion tube.

4. A combustion tube for apparatus for burning 1i uid fuel, and an airsu ply tube closed attlie front end substantia ly parallel with thecombustion tube and connected therewith substanially angentially of saidcombustion tube, and internal partitions sloping backwardly to cause thean enterin the combustion tube from the air supply tu e. to flow towardthe back of said combustion tube.

In testimony whereof I have hereunto set my hand.

WILLIAM M. GRIFFIN.

the air so supplied toward the back end of the combustion tube.

2. In a combustion tube for apparatus for burning liquid fuel, a fuelsupply pipe and its spray nozzle positioned substantially axial- 1% ofsaid tube, means for sup lylng air t rough the wall of said tube sustantially tangentially thereof and contiguous to said '65 nozzle andmeans for diverting the air so sup-

